21753419 has 2 divisors, whose sum is σ = 21753420. Its totient is φ = 21753418.

The previous prime is 21753409. The next prime is 21753533. The reversal of 21753419 is 91435712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21753419 - 2⁸ = 21753163 is a prime.

It is a super-2 number, since 2×21753419² = 946422476379122, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21753409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10876709 + 10876710.

It is an arithmetic number, because the mean of its divisors is an integer number (10876710).

Almost surely, 2^21753419 is an apocalyptic number.

21753419 is a deficient number, since it is larger than the sum of its proper divisors (1).

21753419 is an equidigital number, since it uses as much as digits as its factorization.

21753419 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560, while the sum is 32.

The square root of 21753419 is about 4664.0560674160. The cubic root of 21753419 is about 279.1531342466.

The spelling of 21753419 in words is "twenty-one million, seven hundred fifty-three thousand, four hundred nineteen".